I was thinking of the nobodies, and all of a sudden I came up with a great other for Saix.
(If you people have already noticed this and consider this beating a dead horse, then I don't mind. But I still hope you like it.)
Saix's other is...
SCAR!
Similarities: X-shaped scar between eyes, general hatred towards those against their plans, merciless personalities,
willing to kill anyone in their way, etc.
Differences: Skin color, hair color, name + x (but Scar is not what Scar's real name is, so... it still could be possible), Scar is an anti-hero, Saix is a villain, etc.